What is the in vivo cytotoxicity of HEMA when dentin thickness is very thin?

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Study for the Biocompatibility of Dental Materials Test. Prepare with multiple choice questions and detailed explanations to ensure you're ready for your exam!

Multiple Choice

What is the in vivo cytotoxicity of HEMA when dentin thickness is very thin?

Explanation:
When dentin is very thin, the barrier between the resin adhesive and the pulp is minimal, so HEMA can diffuse into the pulp in higher, potentially cytotoxic concentrations. In vivo, this diffusion can injure pulp cells and odontoblasts, triggering cytotoxic effects and inflammation. So the expected in vivo response with a very thin dentin layer is cytotoxic. If dentin were thicker, the diffusion barrier would limit HEMA’s arrival at the pulp, reducing toxicity; the other options do not fit the situation where a thin dentin barrier permits harmful concentrations to reach the pulp.

When dentin is very thin, the barrier between the resin adhesive and the pulp is minimal, so HEMA can diffuse into the pulp in higher, potentially cytotoxic concentrations. In vivo, this diffusion can injure pulp cells and odontoblasts, triggering cytotoxic effects and inflammation. So the expected in vivo response with a very thin dentin layer is cytotoxic. If dentin were thicker, the diffusion barrier would limit HEMA’s arrival at the pulp, reducing toxicity; the other options do not fit the situation where a thin dentin barrier permits harmful concentrations to reach the pulp.

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